Animated video grid in After Effects | SampleImage expression tutorial
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Position expression:
// Setting parameters
shapeCompWidth = 50; // Shape composition width
compWidth = 1000; // Main composition width
// Calculate the number of items per row
itemsPerRow = Math.floor(compWidth / shapeCompWidth); // Calculate how many items fit in one row based on the composition width and spacing
// Calculate the position
x = (index - 1) % itemsPerRow * shapeCompWidth; // Calculate the x position using the index, spacing, and number of items per row
y = Math.floor((index - 1) / itemsPerRow) * shapeCompWidth; // Calculate the y position using the index, spacing, and number of items per row
[x, y] // Return the calculated position as an array
Time-remap expression:
// Define the target layer
target = thisComp.layer("Footage");
// Position for sampling the value
samplePoint = [transform.position[0], transform.position[1]];
// Sampling size
sampleSize = [1, 1];
// Get the value from the target layer
sample = target.sampleImage(samplePoint, sampleSize);
// Convert the value for use in time remap
// Assuming we're using the red channel (sample[0])
timeRemapValue = sample[0] * thisComp.frameDuration * 100; // Example scaling
// Return the value for time remap
timeRemapValue
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